Immediately, Ryōta realizes that someone had developed a real-life version of Btooom. But still hoping for it to be a lie, Ryōta sets off to explore the island where he finds a stranger. He calls out for help but the stranger instead throws a bomb at him.

The action makes Ryōta confirm his theory and he decides to fight off with his opponents to survive. Initially, Ryōta reluctant to use violence, he soon realizes that in this new reality it's either to kill or be killed, Ryōta packs up several bombs and grudgingly starts killing his competitions.

Later in the show, he collides with another Btooom player named Himiko who is also the in-game wife of Ryōta. The pair decides to team up to survive and give their best shot in overcoming the dreadful recreation of the game.